<?php

namespace WPMailSMTP\Vendor\Aws;

use WPMailSMTP\Vendor\Aws\Exception\AwsException;
use WPMailSMTP\Vendor\Aws\Retry\ConfigurationInterface;
use WPMailSMTP\Vendor\Aws\Retry\QuotaManager;
use WPMailSMTP\Vendor\Aws\Retry\RateLimiter;
use WPMailSMTP\Vendor\Aws\Retry\RetryHelperTrait;
use WPMailSMTP\Vendor\GuzzleHttp\Exception\RequestException;
use WPMailSMTP\Vendor\GuzzleHttp\Promise;
use WPMailSMTP\Vendor\Psr\Http\Message\RequestInterface;
/**
 * Middleware that retries failures. V2 implementation that supports 'standard'
 * and 'adaptive' modes.
 *
 * @internal
 */
class RetryMiddlewareV2
{
    use RetryHelperTrait;
    private static $standardThrottlingErrors = ['Throttling' => \true, 'ThrottlingException' => \true, 'ThrottledException' => \true, 'RequestThrottledException' => \true, 'TooManyRequestsException' => \true, 'ProvisionedThroughputExceededException' => \true, 'TransactionInProgressException' => \true, 'RequestLimitExceeded' => \true, 'BandwidthLimitExceeded' => \true, 'LimitExceededException' => \true, 'RequestThrottled' => \true, 'SlowDown' => \true, 'PriorRequestNotComplete' => \true, 'EC2ThrottledException' => \true];
    private static $standardTransientErrors = ['RequestTimeout' => \true, 'RequestTimeoutException' => \true];
    private static $standardTransientStatusCodes = [500 => \true, 502 => \true, 503 => \true, 504 => \true];
    private $collectStats;
    private $decider;
    private $delayer;
    private $maxAttempts;
    private $maxBackoff;
    private $mode;
    private $nextHandler;
    private $options;
    private $quotaManager;
    private $rateLimiter;
    public static function wrap($config, $options)
    {
        return function (callable $handler) use($config, $options) {
            return new static($config, $handler, $options);
        };
    }
    public static function createDefaultDecider(\WPMailSMTP\Vendor\Aws\Retry\QuotaManager $quotaManager, $maxAttempts = 3, $options = [])
    {
        $retryCurlErrors = [];
        if (\extension_loaded('curl')) {
            $retryCurlErrors[\CURLE_RECV_ERROR] = \true;
        }
        return function ($attempts, \WPMailSMTP\Vendor\Aws\CommandInterface $command, $result) use($options, $quotaManager, $retryCurlErrors, $maxAttempts) {
            // Release retry tokens back to quota on a successful result
            $quotaManager->releaseToQuota($result);
            // Allow command-level option to override this value
            // # of attempts = # of retries + 1
            $maxAttempts = null !== $command['@retries'] ? $command['@retries'] + 1 : $maxAttempts;
            $isRetryable = self::isRetryable($result, $retryCurlErrors, $options);
            if ($isRetryable) {
                // Retrieve retry tokens and check if quota has been exceeded
                if (!$quotaManager->hasRetryQuota($result)) {
                    return \false;
                }
                if ($attempts >= $maxAttempts) {
                    if (!empty($result) && $result instanceof \WPMailSMTP\Vendor\Aws\Exception\AwsException) {
                        $result->setMaxRetriesExceeded();
                    }
                    return \false;
                }
            }
            return $isRetryable;
        };
    }
    public function __construct(\WPMailSMTP\Vendor\Aws\Retry\ConfigurationInterface $config, callable $handler, $options = [])
    {
        $this->options = $options;
        $this->maxAttempts = $config->getMaxAttempts();
        $this->mode = $config->getMode();
        $this->nextHandler = $handler;
        $this->quotaManager = new \WPMailSMTP\Vendor\Aws\Retry\QuotaManager();
        $this->maxBackoff = isset($options['max_backoff']) ? $options['max_backoff'] : 20000;
        $this->collectStats = isset($options['collect_stats']) ? (bool) $options['collect_stats'] : \false;
        $this->decider = isset($options['decider']) ? $options['decider'] : self::createDefaultDecider($this->quotaManager, $this->maxAttempts, $options);
        $this->delayer = isset($options['delayer']) ? $options['delayer'] : function ($attempts) {
            return $this->exponentialDelayWithJitter($attempts);
        };
        if ($this->mode === 'adaptive') {
            $this->rateLimiter = isset($options['rate_limiter']) ? $options['rate_limiter'] : new \WPMailSMTP\Vendor\Aws\Retry\RateLimiter();
        }
    }
    public function __invoke(\WPMailSMTP\Vendor\Aws\CommandInterface $cmd, \WPMailSMTP\Vendor\Psr\Http\Message\RequestInterface $req)
    {
        $decider = $this->decider;
        $delayer = $this->delayer;
        $handler = $this->nextHandler;
        $attempts = 1;
        $monitoringEvents = [];
        $requestStats = [];
        $req = $this->addRetryHeader($req, 0, 0);
        $callback = function ($value) use($handler, $cmd, $req, $decider, $delayer, &$attempts, &$requestStats, &$monitoringEvents, &$callback) {
            if ($this->mode === 'adaptive') {
                $this->rateLimiter->updateSendingRate($this->isThrottlingError($value));
            }
            $this->updateHttpStats($value, $requestStats);
            if ($value instanceof \WPMailSMTP\Vendor\Aws\MonitoringEventsInterface) {
                $reversedEvents = \array_reverse($monitoringEvents);
                $monitoringEvents = \array_merge($monitoringEvents, $value->getMonitoringEvents());
                foreach ($reversedEvents as $event) {
                    $value->prependMonitoringEvent($event);
                }
            }
            if ($value instanceof \Exception || $value instanceof \Throwable) {
                if (!$decider($attempts, $cmd, $value)) {
                    return \WPMailSMTP\Vendor\GuzzleHttp\Promise\rejection_for($this->bindStatsToReturn($value, $requestStats));
                }
            } elseif ($value instanceof \WPMailSMTP\Vendor\Aws\ResultInterface && !$decider($attempts, $cmd, $value)) {
                return $this->bindStatsToReturn($value, $requestStats);
            }
            $delayBy = $delayer($attempts++);
            $cmd['@http']['delay'] = $delayBy;
            if ($this->collectStats) {
                $this->updateStats($attempts - 1, $delayBy, $requestStats);
            }
            // Update retry header with retry count and delayBy
            $req = $this->addRetryHeader($req, $attempts - 1, $delayBy);
            // Get token from rate limiter, which will sleep if necessary
            if ($this->mode === 'adaptive') {
                $this->rateLimiter->getSendToken();
            }
            return $handler($cmd, $req)->then($callback, $callback);
        };
        // Get token from rate limiter, which will sleep if necessary
        if ($this->mode === 'adaptive') {
            $this->rateLimiter->getSendToken();
        }
        return $handler($cmd, $req)->then($callback, $callback);
    }
    /**
     * Amount of milliseconds to delay as a function of attempt number
     *
     * @param $attempts
     * @return mixed
     */
    public function exponentialDelayWithJitter($attempts)
    {
        $rand = \mt_rand() / \mt_getrandmax();
        return \min(1000 * $rand * \pow(2, $attempts), $this->maxBackoff);
    }
    private static function isRetryable($result, $retryCurlErrors, $options = [])
    {
        $errorCodes = self::$standardThrottlingErrors + self::$standardTransientErrors;
        if (!empty($options['transient_error_codes']) && \is_array($options['transient_error_codes'])) {
            foreach ($options['transient_error_codes'] as $code) {
                $errorCodes[$code] = \true;
            }
        }
        if (!empty($options['throttling_error_codes']) && \is_array($options['throttling_error_codes'])) {
            foreach ($options['throttling_error_codes'] as $code) {
                $errorCodes[$code] = \true;
            }
        }
        $statusCodes = self::$standardTransientStatusCodes;
        if (!empty($options['status_codes']) && \is_array($options['status_codes'])) {
            foreach ($options['status_codes'] as $code) {
                $statusCodes[$code] = \true;
            }
        }
        if (!empty($options['curl_errors']) && \is_array($options['curl_errors'])) {
            foreach ($options['curl_errors'] as $code) {
                $retryCurlErrors[$code] = \true;
            }
        }
        if ($result instanceof \Exception || $result instanceof \Throwable) {
            $isError = \true;
        } else {
            $isError = \false;
        }
        if (!$isError) {
            if (!isset($result['@metadata']['statusCode'])) {
                return \false;
            }
            return isset($statusCodes[$result['@metadata']['statusCode']]);
        }
        if (!$result instanceof \WPMailSMTP\Vendor\Aws\Exception\AwsException) {
            return \false;
        }
        if ($result->isConnectionError()) {
            return \true;
        }
        if (!empty($errorCodes[$result->getAwsErrorCode()])) {
            return \true;
        }
        if (!empty($statusCodes[$result->getStatusCode()])) {
            return \true;
        }
        if (\count($retryCurlErrors) && ($previous = $result->getPrevious()) && $previous instanceof \WPMailSMTP\Vendor\GuzzleHttp\Exception\RequestException) {
            if (\method_exists($previous, 'getHandlerContext')) {
                $context = $previous->getHandlerContext();
                return !empty($context['errno']) && isset($retryCurlErrors[$context['errno']]);
            }
            $message = $previous->getMessage();
            foreach (\array_keys($retryCurlErrors) as $curlError) {
                if (\strpos($message, 'cURL error ' . $curlError . ':') === 0) {
                    return \true;
                }
            }
        }
        // Check error shape for the retryable trait
        if (!empty($errorShape = $result->getAwsErrorShape())) {
            $definition = $errorShape->toArray();
            if (!empty($definition['retryable'])) {
                return \true;
            }
        }
        return \false;
    }
    private function isThrottlingError($result)
    {
        if ($result instanceof \WPMailSMTP\Vendor\Aws\Exception\AwsException) {
            // Check pre-defined throttling errors
            $throttlingErrors = self::$standardThrottlingErrors;
            if (!empty($this->options['throttling_error_codes']) && \is_array($this->options['throttling_error_codes'])) {
                foreach ($this->options['throttling_error_codes'] as $code) {
                    $throttlingErrors[$code] = \true;
                }
            }
            if (!empty($result->getAwsErrorCode()) && !empty($throttlingErrors[$result->getAwsErrorCode()])) {
                return \true;
            }
            // Check error shape for the throttling trait
            if (!empty($errorShape = $result->getAwsErrorShape())) {
                $definition = $errorShape->toArray();
                if (!empty($definition['retryable']['throttling'])) {
                    return \true;
                }
            }
        }
        return \false;
    }
}
